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Process Control Using a PID Controller

Application ID: 866

This model shows how a flow model can be coupled to a process control mechanism.

Controlling application parameters according to other application parameters is important within process engineering. Most control mechanisms use the data at a wall or an outlet to control inlet parameters. More accurate control can occur if you can control inlet parameters due to data found within a component or piece of equipment.

This model couples mass transfer to fluid flow with two inlets (one controlled) and a PID controller. In this case, fluid flow is controlled according to the concentration at a point within the geometry - therefore a requirement for a physical model.

The model makes use of Projection variables in order to couple the Ordinary differential equation of the PID controller to the concentration point and the inlet velocity.

The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.